<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- // 警告区域 -->
      <el-alert show-icon title="注意: 只允许为第三级分类设置相关参数!" type="warning" :closable="false"></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="catelist"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 分类区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
          <!-- 动态参数 表格 -->
          <el-table :data="manyTabelData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染Tag 标签 -->
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >修改</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button type="primary" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand">
              <template v-slot="scope">
                <!-- 循环渲染Tag 标签 -->
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >{{item}}</el-tag>
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  size="mini"
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >修改</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + this.titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'添加' + this.titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
	data() {
		return {
			// 商品分类列表
			catelist: [],
			// 级联选择框的配置对象
			cateProps: {
				value: 'cat_id',
				label: 'cat_name',
				children: 'children',
				expandTrigger: 'hover',
			},
			// 级联选择框双向绑定的数组
			selectedCateKeys: [],
			// 被激活的页签的名称
			activeName: 'many',
			// 动态参数 数据
			manyTabelData: [],
			// 静态属性 数据
			onlyTableData: [],
			// 控制添加对话框的显示与隐藏
			addDialogVisible: false,
			// 添加表单的验证规则对象
			addFormRules: {
				attr_name: {
					required: true,
					message: '请输入参数或属性名称',
					trigger: 'blur',
				},
			},
			// 添加表单的列表数据对象
			addForm: {
				attr_name: '',
			},
			// 控制修改对话框的显示与隐藏
			editDialogVisible: false,
			// 修改表单的验证规则对象
			editFormRules: {
				attr_name: {
					required: true,
					message: '请输入参数或属性名称',
					trigger: 'blur',
				},
			},
			// 修改表单的列表数据对象
			editForm: {
				attr_name: '',
			},
		}
	},
	created() {
		this.getCateList()
	},
	methods: {
		// 获商品分类的 列表数据
		async getCateList() {
			const { data: res } = await this.$http.get('categories')

			if (res.meta.status !== 200) {
				this.$message.error('获取分类列表失败!')
			}

			this.catelist = res.data
		},
		// 级联选择框 选中项 变化, 会触发这个函数
		handleChange() {
			this.getParamsData()
		},
		// 获取分类参数的列表数据
		async getParamsData() {
			// 证明选中的不是 三级分类
			if (this.selectedCateKeys.length !== 3) {
				this.selectedCateKeys = []
				// 非三级分类的话,清空表格数据
				this.manyTabelData = []
				this.onlyTableData = []
				return
			}

			// 证明选中的是三级分类
			// 根据所选分类的id, 和当前所处的面板, 获取对应的参数
			const { data: res } = await this.$http.get(
				`categories/${this.cateId}/attributes`,
				{
					params: { sel: this.activeName },
				}
			)

			if (res.meta.status !== 200) {
				this.$message.error('获取参数列表失败!')
			}

			// console.log(res.data)
			res.data.forEach((item) => {
				item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
				// 控制文本框的显示与隐藏
				item.inputVisible = false
				// 文本框中输入的值
				item.inputValue = ''
			})

			if (this.activeName == 'many') {
				this.manyTabelData = res.data
			} else {
				this.onlyTableData = res.data
			}
		},
		// tab 页签点击事件的处理函数
		handleClick() {
			this.getParamsData()
			console.log(this.activeName)
		},
		// 监听添加对话框的关闭事件
		addDialogClosed() {
			this.$refs.addFormRef.resetFields()
		},
		// 点击按钮, 添加参数
		addParams() {
			this.$refs.addFormRef.validate(async (valid) => {
				if (!valid) return
				const { data: res } = await this.$http.post(
					`categories/${this.cateId}/attributes`,
					{
						attr_name: this.addForm.attr_name,
						attr_sel: this.activeName,
					}
				)

				if (res.meta.status !== 201) {
					this.$message.error('添加参数失败!')
				}

				this.$message.success('添加参数成功!')
				this.addDialogVisible = false
				this.getParamsData()
			})
		},
		// 点击按钮. 展示修改的对话框
		async showEditDialog(attrId) {
			const {
				data: res,
			} = await this.$http.get(
				`categories/${this.cateId}/attributes/${attrId}`,
				{ attr_sel: this.activeName }
			)

			if (res.meta.status !== 200) {
				return this.$message.error('获取参数失败!')
			}

			this.editForm = res.data
			this.editDialogVisible = true
		},
		// 监听 修改对话框的关闭事件 重置修改的表单
		editDialogClosed() {
			this.$refs.editFormRef.resetFields()
		},
		// 点击按钮, 修改参数
		editParams() {
			this.$refs.editFormRef.validate(async (valid) => {
				if (!valid) return
				const { data: res } = await this.$http.put(
					`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
					{
						attr_name: this.editForm.attr_name,
						attr_sel: this.activeName,
					}
				)

				if (res.meta.status !== 200) {
					this.$message.error('修改参数失败!')
				}

				this.$message.success('修改参数成功!')
				this.editDialogVisible = false
				this.getParamsData()
			})
		},
		// 根据Id 删除对应的参数项
		async removeParams(cttr_id) {
			const confirmResult = await this.$confirm(
				'此操作将永久删除该参数, 是否继续?',
				'提示',
				{
					confirmButtonText: '确定',
					cancelButtonText: '取消',
					type: 'warning',
				}
			).catch((err) => err)

			if (confirmResult !== 'confirm') {
				return this.$message.info('取消了删除!')
			}
			// console.log('确认了删除');
			const { data: res } = await this.$http.delete(
				`categories/${this.cateId}/attributes/${cttr_id}`
			)

			if (res.meta.status !== 200) {
				return this.$message.error('删除分类失败!')
			}
			this.$message.success('删除分类成功!')

			this.getParamsData()
			// role.children = res.data
		},
		// 文本框失去焦点, 或者摁下了 Enter 都会触发
		async handleInputConfirm(row) {
			//
			if (row.inputValue.trim().length === 0) {
				row.inputValue = ''
				row.inputVisible = false
				return
			}
			// 如果没有return , 则证明有输入内容, 需要做后续处理
			row.attr_vals.push(row.inputValue.trim())
			row.inputValue = ''
			row.inputVisible = false
			// console.log(row)
			this.saveAttrVals(row)
			
		},
		// 将对 attr_vals 的操作, 保存到数据库
		async saveAttrVals(row) {
			const { data: res } = await this.$http.put(
				`categories/${this.cateId}/attributes/${row.attr_id}`,
				{
					attr_name: row.attr_name,
					attr_sel: row.attr_sel,
					attr_vals: row.attr_vals.join(','),
				}
			)

			if (res.meta.status !== 200) {
				this.$message.error('修改参数项失败!')
			}

			this.$message.success('修改参数项成功!')
		},
		// 展示tag 文本输入框
		showInput(row) {
			row.inputVisible = true
			// 让文本框自动获得焦点
			// $nextTick 方法的作用 , 就是当页面上元素被重新渲染之后, 才会指定回调函数中的代码
			this.$nextTick((_) => {
				// console.log(this.$refs.saveTagInput);
				// console.log(this.$refs.saveTagInput.$refs.input);
				this.$refs.saveTagInput.$refs.input.focus()
			})
		},
		// 删除对应的参数可选项
		handleClose(i, row) {
			row.attr_vals.splice(i, 1)
			this.saveAttrVals(row)
		},
	},
	computed: {
		// 控制按钮 是否禁用
		// 如果按钮需要被禁用, 则返回true 否则返回false
		isBtnDisabled() {
			if (this.selectedCateKeys.length !== 3) {
				return true
			}
			return false
		},
		// 当前选中的三级分类的Id
		cateId() {
			if (this.selectedCateKeys.length === 3) {
				return this.selectedCateKeys[2]
			}
			return null
		},
		//
		titleText() {
			if (this.activeName === 'many') {
				return '动态参数'
			} else {
				return '静态属性'
			}
		},
	},
}
</script>

<style lang="less" scoped>
.cat_opt {
	margin: 15px 0;
}
.el-tag {
	margin: 10px;
}
.input-new-tag {
	width: 120px;
}
</style>>
